Brittany the Body Snatcher is an episode of the ALVINNN!!! and The Chipmunks series.
When Brittany begins acting nice towards Alvin, he becomes convinced that aliens have taken over her body.
Dave calls Brittany to invite the girls to a movie, but Alvin is convinced she hates him. The next day Brittany becomes smitten with Alvin after she overhears him defending her when a couple girls decide to talk bad about her. Brittany lets Alvin enter class first, laughs at his joke, and quickly takes the blame when Alvin's phone rings leading Kevin to state a body snatcher, a form of alien, is to blame for the sudden change of behavior. Once someone falls victim to a body snatcher, their job is to find hosts for fellow aliens. Brittany brings over strawberries and cookies in order to see Alvin, but he quickly throws them away, leading her to think she was lame. Following dinner, the boys head upstairs where Alvin's convinced the cookies were infested with baby body snatchers so he scours the Internet for information. Meanwhile, Brittany, in a frightening disguise, visits Dave for advice. Alvin hears Dave and investigates only to learn, from her mask, that Brittany is the body snatcher. Following Brittany's continuous calls to Dave and flirting with Alvin, Alvin has a nightmare and, believing Dave might already be infected, talks with Kevin again. They come up with a plan to force the body snatcher out by threatening him with strawberries, which Dave's allergic to. Dave doesn't give in so they confront Brittany. Brittany, shocked Alvin thinks she's a body snatcher, gets over him and agrees with his demands. With their mission complete, Dave yells "ALVINNN!!!," signaling for Kevin to leave and a happy Alvin to untie Dave.
- This episode is a reference to the film Invasion of the Body Snatchers.
- According to Alvin, Dave is highly allergic to strawberries.
- Alvin's remark about alien eggs hatching in stomachs is a reference to the film Alien.
- Brittany's mobile number is 412-7753.
- A sneak-peek clip was released on Nick.com.
- When this episode premiered in the US, it aired with a rerun of Wax Dave.